* Implement a possibility in the ListNode, to highlight the parent-item,
  when the child-items are stepped through.

* Make use of libpdf to create PDF-files directly.

* Implement a description-environment, which will create <dl>,
  <dt> and <dd> tags in the HTML-output.

* Fix the getopt-calls in main.cc. non-GNU implementations of getopt don't
  seem to recognize an optional argument for a parameter via '::'.
  Is there any other possibility to use optional arguments ?

* Fix the LaTeX-output, when pdflatex is used. The documentclass seminar
  seems to have some features implemented, that don't work with pdflatex.

* Implement a logo, which may be presented on all slides or just on the
  title-slide.

* Complete the the user manual.

* Make the HTML-output of the table of contents "more beautiful".
  Optionally, add informations about the authors to this page.

* Translate the program-messages to other languages.
  (except for "de", "es", "fr", "hu" and "pt_BR")

* Create more themes.

* Introduce a new install-rule, which won't install the documentation.
  Another rule, which installs only the documentation would also be nice.

* Make use of the tool "code2html" to produce source-code with
  syntax-highlighting for the presentation.
  Check out the possibilities to define the colors for the highlighting.

* Adapt the files in the debian-directory, so PresTiMeL will be compliant to
  the Debian philosophy.

* Create and adapt a prestimel.spec.in-file for creating a RPM package.
